Fix performance regressions due to lazy initialization.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4152 matching lines @@
         Utils::OpenHandle(this)->SetInternalField(index, *foreign);
   }
   ASSERT_EQ(value, GetPointerFromInternalField(index));
 }
 
 
 // --- E n v i r o n m e n t ---
 
 
 bool v8::V8::Initialize() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   if (isolate != NULL && isolate->IsInitialized()) {
     return true;
   }
   return InitializeHelper();
 }
 
 
 void v8::V8::SetEntropySource(EntropySource source) {
   i::V8::SetEntropySource(source);
 }
@@ skipping 872 matching lines @@
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     value = i::OS::nan_value();
   }
   ENTER_V8(isolate);
   i::Handle<i::Object> result = isolate->factory()->NewNumber(value);
   return Utils::NumberToLocal(result);
 }
 
 
 Local<Integer> v8::Integer::New(int32_t value) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   EnsureInitializedForIsolate(isolate, "v8::Integer::New()");
   if (i::Smi::IsValid(value)) {
     return Utils::IntegerToLocal(i::Handle<i::Object>(i::Smi::FromInt(value),
                                                       isolate));
   }
   ENTER_V8(isolate);
   i::Handle<i::Object> result = isolate->factory()->NewNumber(value);
   return Utils::IntegerToLocal(result);
 }
 
@@ skipping 257 matching lines @@
 
 
 bool V8::IsExecutionTerminating(Isolate* isolate) {
   i::Isolate* i_isolate = isolate != NULL ?
       reinterpret_cast<i::Isolate*>(isolate) : i::Isolate::Current();
   return IsExecutionTerminatingCheck(i_isolate);
 }
 
 
 Isolate* Isolate::GetCurrent() {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   return reinterpret_cast<Isolate*>(isolate);
 }
 
 
 Isolate* Isolate::New() {
   i::Isolate* isolate = new i::Isolate();
   return reinterpret_cast<Isolate*>(isolate);
 }
 
 
@@ skipping 1011 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal